Airo ORIA 18 INT, Owners And Installation Manual

Page: 52 / 115

lnstallation and Maintenance
4. Refrigerant Piping
i�DANGER
Use refrigerant R32 in the refrigerant cycle (refer to outdoor nameplate). Do not charge oxygen,
acetylene or other flammable and poisonous gases into the refrigerant cycle when performing a
leakage test or an air-tight test. These type of gases are extremely dangerous and can cause an
explosion. lt is recommended that nitrogen be used for these type of tests.
4. 1 The Piping Materials
(1) Prepare locally-supplied copper pipes.
(2)
Select the piping size from the following table.
Model Gas pipe(mm) Liquid pipe(mm)
26-35 09.52 06.35
52
012.7 06.35
71-90 015.88 09.52
105-175
019.05 09.52
(3)
Select clean copper pipes. Make sure there is no dust and moisture inside. Blow the pipes with nitrogen
or dry air to remove dust and foreign materials before connecting pipes.
4. 2 The Piping Connection
(1) Position of piping connection is shown in Fig. 4. 1. (lndoor Unit)
Q)
a.
Q)
o:
a.
1
-------�-
(mm)
"O
o:
1
1
·5
(/)
1
·e:
1
"'
1 2-
1
¿
�
1
1
1
1
CX)
:�
1
;¡!;
1
1
;:._
840 (Unit)
180 (Liquid Pipe)
Liquid Pipe Connection
...."'
26-52
110 (Gas Pipe)
71-175
Fig. 4 .1 Position of Piping Connection
(2) When tightening the fiare nut, use two spanners as shown in Fig.4.2.
Pipe Size(mm) Tightening Torque N.m
<1>6.35 20
cj>9.52 40
<1>12.7
60
<!>15.88
80
<1>19.05 100
Fig. 4 .2 Tightening Work of Fiare Nut
51